USB lithium battery charging, with sn and 3 small buttons to set hours or minutes, the maximum setting time is 99 hours and 59 minutes. USB charging lasts for 120 hours. When the lock is locked, it will not open and it is impossible to break it by hand. Please set the time reasonably. The padlock combination is lightweight and suitable for airport and travel safety. You can lock your important items at any time to protect your privacy. Model Number: Smart Time Lock weight 30g Feature 1: LCD Time Lock Feature 2: USB Rechargeable Temporary Timer Padlock If you find you can not operate the timeout or the LCD is not displayed. correctly. Please follow this way to timer: 1: Press the center of the LCD sn to strip the protective film and tear the film off. You will find a stop under a screw on the left side of the sn. 2: Find a metal pin or metal clip and insert it into the hole to the end and then run it. 3: When you hear a "Bi" sound (in sound mode), the LCD will display correctly. The timeout has been successfully reset. 4: Please glue the protective film back on. colour:Black Material:ABS size:7.3 x 4.7 x 2Cm Package Contents: 4 x Time Lock